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The change comes as the new sugar tax is introduced, which came into effect on Friday, April 6. It means makers of soft drinks have to pay a levy on the high-sugar drinks they sell, reports Wales Online.

Drinks which have (and haven't) cut their sugar

Irn Bru Cut sugar from 10.3g to 4.7g per 100ml

Ribena Cut sugar from 9.9g to less than 4.5g per 100ml

Lucozade Cut sugar from 13g to less than 4.5g per 100ml

Coca Cola No change, sugar remains at 10.6g per 100ml

Pepsi No change, remains at 11g per 100ml

Makers of soft drinks with more than 5g of sugar per 100ml will pay 18p a litre to the Treasury. That increases to 24p a litre if the sugar content is over 8g per 100ml.

The comparison of sizes between the two bottles of Pepsi

And while some brands, such as Irn Bru, have changed their recipe, the likes of Pepsi, Coca-Cola and Old Jamaican Ginger Beer have all refused to change their recipe. So meal deal-size drinks will now be smaller to make room for the tax price hike. Coca Cola and Pepsi have changed bottle size to keep the price the same.

See how people responded:

And if you're wondering how you'll function without your usual 500ml portion? Take a leaf out of Scotland's Irn Bru-gate book, and start stocking up on the now-supersize bottles from all the old stock at newsagents while you still can.

The 375ml bottle next to the 500ml bottle

Or, simply dig a little deeper at Tesco, where one savvy Twitter user has spotted that the new Coca-Cola prices don't quite appear to add up. The user, named Tele_Vision, has noticed that while their new 375ml bottle costs £1.30, so does their new 'Special Edition' 750ml bottle.

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Talking about the change to their meal deal, a Tesco spokesperson said: "At Tesco, we’ve made lots of little changes over the years to make it easier for our customers to make healthier choices.

"We were really proud to be the first retailer to reduce sugar to below 5 grams per 100ml in all our own-label soft drinks in 2016, helping our customers to consume less sugar while still enjoying the same great taste."